<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
        <!--头部警告区域 -->
        <el-alert title="注意：只允许为第三级分类设置相关参数" type="warning" 
        :closable="false"
        show-icon></el-alert>

        <!-- 选择商品分类区域 -->
        <el-row class="cat_opt">
            <el-col>
                <span>选择商品分类：</span>
                <el-cascader
                v-model="selectedCateKeys"
                :options="cateList"
                :props="{ ...cateProps }"
                @change="handleChange"></el-cascader>
            </el-col>
        </el-row>

        <!-- tab页签区域 -->
        <el-tabs v-model="activeName" @tab-click="handleClick">
            <!-- 添加动态参数的面板 -->
            <el-tab-pane label="动态参数" name="many">
                <!-- 添加参数的按钮 -->
                <el-button type="primary" size="mini" 
                :disabled="isBtnDisabled"
                @click="addDialogVisible = true">添加参数</el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTabData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable
                            @close="handleClosed(i,scope.row)">{{item}}</el-tag>
                            <!-- 输入文本框 -->
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)">
                            </el-input>
                            <!-- 添加的按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index" label="#"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini"
                            @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini"
                            @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            
            <!-- 添加静态属性的面板 -->
            <el-tab-pane label="静态属性" name="only">
                <!-- 添加属性的按钮 -->
                <el-button type="primary" size="mini"  
                :disabled="isBtnDisabled"
                @click="addDialogVisible = true">添加属性</el-button>
                <!-- 静态属性表 -->
                <el-table :data="onlyTabData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable
                            @close="handleClosed(i,scope.row)">{{item}}</el-tag>
                            <!-- 输入文本框 -->
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)">
                            </el-input>
                            <!-- 添加的按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index" label="#"></el-table-column>
                    <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini"
                            @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini"
                            @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            
          </el-tabs>

    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
        :title="'添加' + titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed">
        <!-- 添加参数的对话框 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
              <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
     </el-dialog>

     <!-- 修改参数对话框 -->
     <el-dialog
        :title="'修改' + titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed">
        <!-- 添加参数的对话框 -->
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
              <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
     </el-dialog>
  </div>
</template>

<script>

export default {
    data() {
        return {
            // 商品分类列表
            cateList: [],
            // 级联选择框配置对象
            cateProps:{
                value: 'cat_id',
                label: 'cat_name',
                children: 'children',
                expandTrigger: 'hover'
            },
            // 级联选择框双向绑定到的数据
            selectedCateKeys: [],
            // 被激活的页签标签的名称
            activeName: 'many',
            // 动态参数的数据
            manyTabData: [],
            // 静态属性的数
            onlyTabData: [],
            // 控制添加对话框的显示与隐藏
            addDialogVisible: false,
            // 添加表单的数据对象
            addForm: {},
            // 添加表单的验证对象
            addFormRules: {
                attr_name:[
                    { required: true ,message: '请输入参数名称' ,trigger: 'blur'},
                ]
            },
            // 控制修改对话框的显示与隐藏
            editDialogVisible: false,
            // 修改的表单数据对象
            editForm: {},
            // 修改表单的验证对象
            editFormRules:{
                attr_name:[
                    { required: true ,message: '请输入参数名称' ,trigger: 'blur'},
                ]
            },
            // 控制按钮与文本框的切换显示
            inputVisible: false,
            // 文本框中输入的内容
            inputValue: ''
        }
    },
    created() {
        // 获取所有的商品分类列表
        this.getCateList()
    },
    methods:{
        async getCateList() {
            const {data:res} = await this.$http.get('categories/')
            if(res.meta.status !== 200) return this.$message.error('获取商品分类列表成功')
            this.cateList = res.data
            // console.log(this.cateList);
        },
        // 级联选择框选中项变化会触发这个函数
        handleChange() {
            this.getParamsData()
        },
        // tab页签点击事件处理函数
        handleClick() {
            this.getParamsData()
        },
        // 获取参数列表
        async getParamsData() {
            // 证明选中的不是三级分类
            if(this.selectedCateKeys.length !== 3){
                this.selectedCateKeys = []
                this.manyTabData = [],
                this.onlyTabData = []
                return 
            } 
            // 证明选中的是三级分类
            // 根据所选分类Id，和当前所处的面板获取对应的参数
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
            if(res.meta.status !== 200) return this.$message.error('获取参数失败')

            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ?
                item.attr_vals.split(',') : []

                // 控制文本框的显示与隐藏
                item.inputVisible = false
                // 文本框输入的值
                item.inputValue = ''
            })

            console.log(res.data)

            if(this.activeName === 'many'){
                this.manyTabData = res.data
            }else{
                this.onlyTabData = res.data
            }
        },
        // 添加参数/属性对话框关闭事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮添加参数
        addParams() {
            this.$refs.addFormRef.validate(async vaild => {
                if(!vaild) return 
                const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })
                if(res.meta.status !== 201) return this.$message.error('添加参数失败')

                this.$message.success('添加参数成功！')
                this.addDialogVisible = false
                this.getParamsData()
            })
        },
        // 点击按钮，展示修改的对话框
        async showEditDialog(attr_id) {
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`
            ,{params:{attr_sel:this.activeName}})

            if(res.meta.status !== 200) return this.$message.error('获取参数失败')
            this.editForm = res.data
            this.editDialogVisible = true
        },
        // 重置修改的表单
        editDialogClosed() {
           this.$refs.editFormRef.resetFields() 
        },
        // 点击按钮修改参数
        editParams() {
            this.$refs.editFormRef.validate(async vaild => {
                if(!vaild) return
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name: this.editForm.attr_name,
                    attr_sel: this.activeName
                })

                if(res.meta.status !== 200) return this.$message.error('修改参数失败！')
                this.$message.success('修改参数成功！')

                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        // 根据Id删除对应的参数项
        async removeParams(attr_id) {
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).catch(err => err)

            // 用户点击了取消按钮
            if(confirmResult !== 'confirm') {
                return this.$message.info('已取消删除')
            }   

            // 删除的业务逻辑
            const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)

            if(res.meta.status !== 200) return this.$message.error('删除参数失败！')

            this.$message.success('删除参数成功')

            this.getParamsData()

        },
        // 文本框失去焦点或摁下enter键
        async handleInputConfirm(row) {
            if(row.inputValue.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return 
            }
            // 如果没有return，则证明输入的内容需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            // 需要发起请求保存数据到数据库中
            this.saveAttrVals(row)

        },
        // 将对attr_vals的操作保存到数据库
        async saveAttrVals(row){
            const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
            {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(',')
            })

            if(res.meta.status !== 200) return this.$message.error('修改参数项失败！')

            this.$message.success('修改参数项成功！')
        },  
        // 点击按钮展示文本输入框
        showInput(row) {
            row.inputVisible = true
            // 让文本框自动获取焦点
            // $nextTick方法与作用，当页面元素被重新渲染之后才会执行代码
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // 删除对应的参数可选项
        handleClosed(i,row) {
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    
    },
    computed:{
        // 如果按钮需要被禁用则返回true，否则返回false
        isBtnDisabled() {
            if(this.selectedCateKeys.length !== 3){
                return true
            }
            return false
        },
        // 当前选中的三级分类的Id
        cateId() {
            if(this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题
        titleText() {
            if (this.activeName === 'many'){
                return '动态参数'
            }
            return '静态属性'
        }
    }
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin: 15px 0px;
}
.input-new-tag{
    width: 120px;
    margin-left: 5px;
}
.button-new-tag{
    margin-left: 5px;
}
</style>